mongodb查询分析？

Question

场景：有一个关于分类记录collection,分类name（string，中文，英文，数字等组成）字段上有索引方便快速筛选某个分类记录,现在查询出来需要排序，查询条件{name:"F1"}，排序条件{_id:-1}

mongodb查询explain分析,这是winningPlan

      {"stage": "SORT",
        "planNodeId": 3,
        "sortPattern": { "_id": 1 },
        "memLimit": 104857600,
        "limitAmount": 5,
        "type": "simple",
        "inputStage": {
          "stage": "FETCH",
          "planNodeId": 2,
          "inputStage": {
            "stage": "IXSCAN",
            "planNodeId": 1,
            "keyPattern": { "name": -1 },
            "indexName": "name_-1",
            "isMultiKey": false,
            "multiKeyPaths": { "name": [] },
            "isUnique": false,
            "isSparse": false,
            "isPartial": false,
            "indexVersion": 2,
            "direction": "forward",
            "indexBounds": {
              "name": ["[\"F1\", \"F1\"]"]
            }
          }
        }

SORT + FETCH + IXSCAN 这算不算bad查询，通常是FETCH + IXSCAN。